Out of interest, for those who did watch the mixed 50k walking race in The world Championships, the winner averaged 6min 21sec for the entire distance.
Ive seen a few race walking events in the past, they were held around the Wentloog Flats outside Newport, and it was remarkable to see how quickly they could race walk.
The really fast ones, at the front, could walk at around 6minute mile pace, and maintain that pace for up to marathon distance.
It just puts the human body, and what's its capable of, into perspective.